How many seconds of space should you keep between you if you're driving a 100 foot truck 30 mph?

The space in seconds that will be kept = 2.27 seconds

Explanation:

S = d/t Equation 1

making t the subject of formula in the equation above,

t = d/S Equation 2

Where S = speed, d = distance, t = time.

Conversion: (i)if 1 mph = 0.44704 m/s,

                then, 30 mph = 30×0.44704    

               = 13.41 m/s

              (ii) If 1 foot = 0.3048 m

           then, 100 foot = 30.48 m.

Given: S = 30 mph = 13.41 m/s, d = 100 foot = 30.48 m

Substituting these values into equation 2

t = 30.48/13.41

t = 2.27 seconds.

Therefore the space in seconds that will be kept = 2.27 seconds

the answer is a)

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